Adjustable scaffold.



G.BONENBERGER[ ADJUSTABLE SGAFFOLD.

APPLICATION FILED FEBIZ, 1913. RENEWED APR.6,1914.

1,109,505. 7 Patented Sept. 1, 1914.

./ Allorney gnonenromrnaona,

. of Indiana,

-. UNITED S1 rue comrnnr,

ADJUSTABLE: sag-e it;

- swiflcafion or new; rates- Patented Sept. 1, 1914.

Application filed February 12, lfll se'idal No Mix 8- rlil chlwqdrmlt 6,4914. Serial lie-830,088.

To. alhwhomtt ma'y mnoemz.

; Be it known that I, Gnonon Bonnnnnaqng a citizen of the United States, residin at Evansville, county of Vanderburg, and

have invented certain new and useful Improvements in Adjustable Scaffolds, of whichthe following is a specification.

My invention relates to adjustable scaffolds.

The present invention'has for its object the provision of an adjustable vscaffold of the trestle type which will be'of strong, durable and inexpensive construction and provided with improved quick-acting devices for clamping and adjusting up and down a piece of board or timber constituting the plank supporting member of the scaffold.

My invention seeks to provide improved means whereby lateral movement of the adjustable scaffold is minimized and this I accomplish by the provision of a leg or standard having a. fixed memberaand an adjustable clamping member, combined with a vertically adjustable angle-iron supporting bar, a brace, and other instrumentalities appearing more fully hereinafter.

In the accompanying drawings: Figure 1 is a perspective of a scaffold constructed according to the present invention; Fig. 2, a detail vertical sect-ion of the upper pa-rt of the upright and the upper hook clamp; Fig. 3, a detail cross section of the other hook clamp; Fig. 4, a detail vertical section showing the hook on the frame; and Fig. 5, a detail section showing the hook clamp on the brace.

The complete scaffold consists of duplicate constructions, only one of which is described, a pair being used to support a plank in a horizontal position, subject to leveling and any desired up and-down adjustment. With two such trestle scaffolds provided, it is only necessary to rest planks on them to provide a complete scaffold.

The present invention resides in the construction. of one of the adjustable scaffold supports and its brace.

The standard or frame 1 is of angle-iron construction and preferably in one piece with the exception that its cross brace 2 is riveted or welded to the legs thereof. This insures rigidity and strength. The adjustabl upright 3 is of angle-iron construct-ion and provided with elongated slots 4 in one i rii rwe sm.iQmthe .ycrossepiece' 2 is a-rigid health which 'is ad'apted for reception in any Extending loosely through the upper part to pass-through any one. of the uppermost of the openlngs f4 and has a screw-threaded shank 8 on which is a clamping handle 9, by which the adjustable upright may be rigidly clamped agaln'st the frame 1, a part of the welght sustained by the upright being taken up by the hook 5 and another part by the hooked clamp 6 and the latter, by reason of its drawing theupright firmly against the frame, affords absolute rigidity of connection of the upright to said frame.

The upper part of the upright is offset and may be solid at 10', through which loosely passes the shank of a hook clamp 11, which is in all respects similar to the hook clamp 6 except that it has a point 12 adapted to embed itself in the wooden trestle plank 01' top 13 which is supported inedgewise position by the said hook clamp, the latter firmly binding the plank 18 against the upper end of the upright.

Pivoted at 14 to the upright is a brace 15 having a seat 16 arranged oppositely to the offset upper part of the upright and there is provided a hook clamp 17, similar to the hook clamp 11, but which is arranged oppositely thereto so that it clamps agalnst the OFFICE.

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opposite side of the plank 13, thus prevent- I 1 ing lateral springing of the plank.

The upright being vertically adjustable may be raised or lowered to any desired extent, and the brace being pivoted, can be brought to any angle to properly engage the plank 13.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In an adjustable scaflold, the combination with a frame having a laterally projecting fixed hook, of a laterally projecting hook clamp carried by the frame at a diflerent height from the fixed hook, said hook and hook clamp being in vertical alinement, an angle iron upright provided with a row of elongated openings, differentones of which are adapted to receive the hook and the hook clamp at different heights of said upright at the same time, said hook clamp being adapted to engage one of the webs of said angle iron upright and to' bind it 2 I I I 1,109,505

against the frame, and means on the upadapted to receive a scaffold plank and to 10 right adapted to engage a scaffold or trestle engage opposite sides thereof. cross-piece. p In testimony whereof, I hereunto afix my 2. In an afdjustabl; scafiold, 1tlhe 30ml???- signature in presence of two witnesses. tion wit a rame, 0 an uprig ta jus a e in relation thereto, means for securing the .BONENBERGER' upright to the frame, a brace pivoted to'the Witnesses: upright, and oppositely set hook clamps car- J. R. Goonwm, rled by the brace and the upright which are 1 FICJGORE. 

